Delay-constrained sleeping mechanism for energy saving in cache-aided ultra-dense network

作     者：Pei LI Shulei GONG Shen GAO Yaoyue HU Zhiwen PAN Xiaohu YOU 

作者机构：National Mobile Communications Research Laboratory Southeast University Institute of Space-Terrestrial Intelligent Networks School of Electronic Science and EngineeringNanjing University China Mobile Group Jiangsu Co. Ltd. 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2019年第62卷第8期

页      面：131-144页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统] 

基　　金：supported by National Major Project (Grant No. 2017ZX03001002-004) National Natural Science Foundation Project of China (Grant No. 61521061) 333 Program of Jiangsu (Grant No. BRA2017366) 

主　　题：ultra-dense networks sleeping mechanism mean delay caching strategy energy saving 

摘      要：We investigate an energy-saving sleeping mechanism in a cache-aided ultra-dense network(UDN)with delay constraints. As in existing works, we consider the video and file contents of the UDN. The video contents are cached at and delivered by a small-cell base-station(sBS). The cache-aided sBS cooperates with a macro-cell base-station(mBS) to service the file contents. The optimal sleeping strategy that conserves energy under the delay constraint is formulated as an energy-consumption minimization problem under the network stability condition with a guaranteed delay constraint. To find its solution, the minimization problem is transformed into a joint optimization problem of energy consumption and delay by the Lyapunov technique.A delay-constrained sleeping algorithm is proposed, and its effectiveness is confirmed by the numerical results of a simulation study. A tradeoff between energy consumption and delay, achieved by adjusting the weighting factor in the cache-aided UDN, is also demonstrated.